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50
METALLURGY OF IRON AND STEEL.
Ledebur* prefers pure limestone to those containing magnesia, and Bellf agrees that lime has an affinity for sulphur, whereas magnesia has little or none. On the other hand, Phillips} says that dolomite is quite as efficient as limestone and more so when low sulphur is
TABLE II-A. Composition of Blast Furnace Slags.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26	Slag.							Iron.		Remarks.	
	BIO,	A1S0S	CaO	MgO	FeO	S	Total not including 8.	8i	S		
	33 10 32.27 24 26 32.68 82.28 34.50 34.98 34.70 33.68 29.86 28 95 30 '62 32.55 30 08 31.46 36.08 37.19 36.86 32.06 33.57 35.38 36.35 33.70 35.11 35.10 35.84	14.92 14.57 11.53 13.50 9.38 7.94 12.05 11.44 11.93 12.04 12 04 10.47 11.13 11 44 11.50 12.85 12.65 10.74 11.97 10.65 11.76 10.2' 12.56 14.21 14. 7f 14.34	40.76 41.02 40.25 43 28 46.95 46.47 41.33 41.27 45.96 45.20 49.30 49.13 47.16 4636 44.85 41.69 85.47 42.46 42.46 44.11 38.19 40.10 38 12 28.41 27.95 32.71	9.67 10.30 13.28 9.44 9.52 10.47 9.62 9.96 6.69 11.41 8 46 7 49 6.61 8.76 10.41 7.25 11.32 6.62 10.25 8.55 12.32 10 95 11.60 22.38 22 28 17.46			98.45 98.16 98.32 98.90 98.13 99 38 97 98 97 37 98.26 98.51 98.75 97.71 97.45 96.64 98 22 98.41 97.53 97.31 97 37 97.69 98.53 98.60 98.30 100.12 100.08 100.35	3.37 3.18 4.81 1.25 0.70 0.69 2,60 2.32 1.27 1.27 .57 .26 .15 .58 .20 2.15 1.92 1.50 1.59 0.94 1.13 0.66 0.50 1.37 1.85 1.60	tr. tr. ,01 .06 .11 .05 .03 .02 .02 .02 tr. .02 .03 .03 .07 .020 .029 .028 .032 .017 .040 095 .101 .048 .038 .034	Cuban ore, hot f '      wan 1      cool Spanish ore, hot 1   coo A                 < Lake ore and part an-1    thracite j    coal ; most-' lyConnells-ville coke. 1 Lake ore and >•   Conn ells-' j    ville coke.	urnace. m. furnace. . furance. Hot furnace. Fairly hot. Normal. Cool. r Av.of 8 weeks "  7 weeks [    "7 weeks
											
											
											
											
											
											
											
											
					......	....					
											
											
											
											
					0.54 0.90 0.63 0 63 0 81 0 90 0.99 0.32	1 62 1.70 1 54 1.76 1.74 1.60 1.28 0 96					
											
											
											
Averages for hot furnaces— 11.08
33.21 34.84 31.77 35.55
13.67 11.75
12.05
40.68
45.58 40.52
0.68
33.15 30 73 34.75 35.35
10.27 11.32 11.30 14.43
45.57 47.86 40.12 29.69
20.71
1.26
1.40
9S.64 97.68 98.38 97.66
97.75
100.18
3.79 2.46 1.27 1.79
n.88
0.35 0.81 1.61
Cuban ore. 025 Spanish ore.
027 Lake ore.
.07
Cuban ore.
.03 Spanish ore. .068 Lake ore. .040'
NOTE—All slags are from Steelton furnaces except Nos. 24, 25 and 26.   The ore mixture was $he same in all the cases where Spanish ore was used.
required.  Mrmstone§ argues that under certain conditions the sulphur is reduced by substituting dolomite for limestone, and states
* Kaernther Zeitschrift, No. 2,1881, p. 53.
$ Iron Making in Alabama; Ala. Geol. Survey,:
§ Tram. A. I. M. E. Yol. XXIY, p, 498,
t Manuf. Iron & Steel p. 58. 8, p. 73.